I wonder if anyone else has seen this behaviour.
An Optiplex 9030((also seen on 7440) running win10 ent x64 using an i217-lm onboard nic. Boot is set to uefi ipv4 then windows boot.
On first boot up it contacts dhcp, gets an ip then pxe boots fine.
Then in windows and after a restart dhcp fails, meaning pxe boot fails.
Conversely In windows, if its shutdown and turned off, dhcp works fine on boot.
If i turn off Wol on the nic through windows dhcp and pxe work fine all the time, but we use WoL.
Bios is at the latest, nic drivers are the latest from intel, windows is on the creators update.